Sifted together the flour, sugar and baking powder in a bowl, then cut in the margarine, milk, and vanilla extract. Stir over a low speed briefly, then adjust to the middle speed, stir for 1 minute until all the ingredients are well-combined. Pour the mixture into the prepared baking pan and bake in the preheated oven for 30 minutes.

While baking the cake, you can prepare for the topping. Mix all the ingredients for the topping in a small bowl. Take the cake out from the oven and spread the topping evenly on the cake. Return to oven and continue baking for another 8-10 minutes until it turns golden and a toothpick inserted in the center of the cake comes out clean.

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